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The bourrelet bearing surface generally has a longitudinal width of about one-sixth caliber machined with a smooth surface to reduce friction wear of the rifling lands. If the bourrelet diameter is not a close fit, the in-bore yaw angle will affect the stability of a projectile during flight. However, excessive pressures may be generated within ...
Russian 122 mm shrapnel shell, which has been fired, showing rifling marks on the copper driving band around its base and the steel bourrelet nearer the front. A driving band or rotating band is a band of soft metal near the base of an artillery shell, often made of gilding metal, [1] copper, or lead.
The caliber of the barrel was 400 mm. Its length was 14,000 mm (L/35), with a length of bore of 12,700 mm. The outer diameter of the central part was 1,670 mm. The total weight was 121,000 kg (119 tons [4]), including the breech block of 3,760 kg. [2] The barrel had 92 grooves with a progressive twist.
In World War I 45-caliber naval gun barrels were typical, in World War II 50- to 55-caliber barrels were common, with Germany already manufacturing tank guns of 70 calibers by 1943. Today, 60- to 70-caliber barrels are not uncommon, but the latest technology has allowed shorter barrels of 55 calibers to attain muzzle velocities of 1,750 m/s ...
The Springfield Model 1822 was a .69 caliber flintlock musket manufactured by the United States in the early 19th century. The Model 1822 was an improvement to the Springfield Model 1816. Some documents refer to the Model 1822 as its own separate model, but other documents refer to it as a variant of the Model 1816 designated as the Type II. [2]
The first appearance in technical data of the top assembly for the 76-mm HVAP-T round was dated January 31, 1945, as the T40E20 (75-1-220), though its individual components are accounted for earlier. The shot, HVAP-T, 76-mm or 3 in., M93 metal parts assembly (75-2-361) was official and approved November 11, 1944.
Only the caliber of 40 mm and caliber length of L/60 are somewhat universal in branding. Due to this the gun is often specified by the calibre length "L/60". [13] [page needed] Enthusiasts and experts usually call the gun "Bofors 40 mm L/60" [4] or simply "Bofors 40/60" and the like.
Armour piercing discarding sabot munitions were developed to increase penetrating performance of anti-tank projectiles by generating higher impact velocity.A larger projectile would require a completely new weapon system, but increasing velocity faced the limitation that steel armour-piercing (AP) projectiles shattered at velocities above about 850 m/s when uncapped.